siderophore mediated uranium sequestration by marine cyanobacterium synechococcus elongatus bdu 130911

four different marine cyanobacterial morphotypes were tested for their efficacy to produce siderophores in fe minus [fe(−)], fe minus uranium dosed [fe(−)u(+)], and fe dosed uranium dosed [fe(−)u(+)] media. of the four organisms tested, synechococcus elongatus bdu 130911 produced the highest amount of siderophore of 58 μg mg⁻¹ dryweight. the results clearly indicate that uranium induces siderophore production in marine cyanobacteria even in the presence of iron [fe(−)u(+)] condition. the type of siderophore revealed by fecl₃, tetrazolium and atkin’s tests is a hydroxamate; and thin layer chromatogram also authenticates our finding. uranium siderophore complexation was confirmed through modified chrome azurol s (cas) assay as well as based on residual uranium presence. in silico docking studies further validate siderophore complexation with uranium.